<template>
  <div class="star" :class="starType">
      <span v-for="itemClass in itemClasses" :class="itemClass" track-by="$index" class="star-item"></span>
  </div>
</template>

<script type="text/ecmascript-6">
const LENGTH = 5;
const CLS_ON = 'on';
const CLS_HALF = 'half';
const CLS_OFF = 'off';

export default {
  props: {
    size: {
      type: Number
    },
    score: {
      type: Number
    }
  },
  computed: {
    starType() {
      return 'star-' + this.size;
    },
    itemClasses() {
      let result = [];
      let score = Math.floor(this.score * 2) / 2;
      let hasDecimal = score % 1 !== 0;
      let integer = Math.floor(score);
      for (let i = 0; i < integer; i++) {
        result.push(CLS_ON);
      }
      if (hasDecimal) {
        result.push(CLS_HALF);
      }
      while (result.length < LENGTH) {
        result.push(CLS_OFF);
      }
      return result;
    }
  }
};
</script>

<style scoped lang="stylus" rel="stylesheet/stylus">
    @import '../../common/stylus/mixin.styl';
    .star
        .star-item
            display inline-block
            background-repeat no-repeat
        &.star-48
            .star-item
                width 20px
                height 20px
                margin-right 22px
                background-size 20px 20px
                &:last-child
                    margin-right 0
                &.on
                    bg-image('star48_on');
                &.half
                    bg-image('star48_half');
                &.off
                    bg-image('star48_off');
        &.star-36
            .star-item
                width 15px
                height 15px
                margin-right 6px
                background-size 15px 15px
                &:last-child
                    margin-right 0
                &.on
                    bg-image('star36_on');
                &.half
                    bg-image('star36_half');
                &.off
                    bg-image('star36_off');
        &.star-24
            .star-item
                width 10px
                height 10px
                margin-right 3px
                background-size 10px 10px
                &:last-child
                    margin-right 0
                &.on
                    bg-image('star24_on');
                &.half
                    bg-image('star24_half');
                &.off
                    bg-image('star24_off');
</style>